However, the single most impactful, game-deciding upgrade you can possibly achieve is the overall level of your King Tower (your base account level).
The level of your King Tower dictates the maximum hitpoints and the damage-per-second of all three of your defensive structures (the two Princess towers and the central King tower).
The Mathematics of Survival
However, if your Princess tower is only level 10, it will deal slightly less damage per shot, requiring FOUR shots to kill that same level 11 Goblin.
Conversely, having a higher level tower than your opponent means your towers act as an incredibly potent, passive defense, cleaning up small pushes entirely on their own without requiring you to spend elixir.
If you are underleveled, you MUST play perfectly.Upgrading low-level cards you don't even use is a great way to farm Account XP cheaply.The King Tower damage also increases.
Intimidation Factor
When the match loads and the opponent sees that your towers are level 14 while theirs are level 13, they immediately know they are fighting an uphill battle.
You know that your towers can absorb a few extra hits from a stray Miner or a predictive Fireball without crumbling.
Gaining Account XPGold-to-XP RatioUpgrading Cards from Lv 1 to Lv 5Extremely High; costs almost no gold and provides a solid chunk of base XPDonating Rare Cards to ClanmatesMaximum Efficiency; provides you with both Gold AND massive Account XP simultaneously
The Invisible Shield
Never view your King level as a secondary, passive stat that just happens organically.
When a match comes down to a 50-hitpoint tiebreaker in overtime, you will be thankful for that extra level.
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